Step 2: Batter and Baking
Whisk the flour, baking soda, baking powder, and salt in a bowl and set aside. With an electric mixer, cream the butter and sugars until light and fluffy. Beat in the eggs one at time, and add the vanilla and butter flavoring.
In another bowl, combine the buttermilk and cream soda. Alternate adding this mixture and the flour mixture to the sugar batter.
Using a microwave or double broiler, melt the butterscotch chips to a softer consistency. The chips should just be stirred enough so that they lose their shape. Mix the butterscotch into the batter.
Fill the cupcake liners a little over half-way each, and bake them for 15 minutes.